一般錯誤：2031聯合兩個查詢（laravel數據表）

Question

當對它們形成集合被推到laravel數據表生成器中的查詢：

foreach (Session::get('trienios') as $trienio) { 
    $oeTrienios = $oeTrienios->where('data_trienio', $trienio->trienio)->whereHas('curso', function ($query) use ($trienio) { 
     $query->where('curso', $trienio->curso); 
    }); 
} 

$union = Trienio::with('curso')->whereHas('curso', function ($query) use ($coordinatedCourse) { 
    $query->where('curso', $coordinatedCourse); 
})->union($oeTrienios); 


$trienios = \DB::table(\DB::raw("({$union->toSql()}) as x"))->select(['data_trienio']); 

有官方laravel-的DataTable網站教程該「解釋」如何與聯合國查詢的工作，但它是非常模糊的，不能真實地說明什麼，而且，當我試圖增加他們對本教程代碼：

$trienios = \DB::table(\DB::raw("({$union->toSql()}) as x")) 

它給我出現以下錯誤：

SQLSTATE[HY000]: General error: 2031 (SQL: select count(*) as aggregate from (select `data_trienio` from ((select * from `trienios` where exists (select * from `cursos` where `trienios`.`curso_id` = `cursos`.`id` and `curso` = ?)) union (select * from `trienios` where `data_trienio` = ? and exists (select * from `cursos` where `trienios`.`curso_id` = `cursos`.`id` and `curso` = ?) and `data_trienio` = ? and exists (select * from `cursos` where `trienios`.`curso_id` = `cursos`.`id` and `curso` = ?))) as x) count_row_table) 

但是，如果我將參數->get()附加到->union($oeTrienios)，它將工作得很好，但是，該集合在數據表上無法收錄。

我該如何解決這個問題？任何幫助將是非常受歡迎的。

P.S - 鏈接到演示：https://datatables.yajrabox.com/fluent/union

Answer 1

子查詢$union->toSql()只有不帶參數的SQL代碼，你需要調用bindings。請參閱here，代碼將爲：

$trienios = \DB::table(\DB::raw("({$union->toSql()}) as x")) 
    ->select(['data_trienio']) 
    ->mergeBindings($union);